Update changeset config to reflect changes from main (Shopify#10253)

<!--
  ☝️How to write a good PR title:
- Prefix it with [ComponentName] (if applicable), for example: [Button]
  - Start with a verb, for example: Add, Delete, Improve, Fix…
  - Give as much context as necessary and as little as possible
  - Prefix it with [WIP] while it’s a work in progress
-->

### WHY are these changes introduced?
Shopify#10238 merged in changes from main, inclusive of removing the
`polaris-cli` and `polaris-codemods` packages. Unfortunately these
changes were not reflected in the changeset config resulting in errors
when running `yarn changeset` due to ignores being set up for the
aforementioned removed packages.

Error:
![Screenshot 2023-08-28 at 11 06 56
am](https://github.com/Shopify/polaris/assets/12119389/143d9e19-375d-4f37-a591-dd2d46511cca)


<!--
  Context about the problem that’s being addressed.
-->

### WHAT is this pull request doing?

* Removes removed packages (`polaris-cli` `polaris-codemods`) from
changest config ignore.

<!-- ℹ️ Delete the following for small / trivial changes -->

### How to 🎩

Run `yarn changeset` locally on branch.

Author: gwyneplaine

.changeset/config.json

@@ -8,8 +8,6 @@
   "baseBranch": "main",
   "updateInternalDependencies": "patch",
   "ignore": [
-    "@shopify/polaris-cli",
-    "@shopify/polaris-codemods",
     "@shopify/polaris-migrator",
     "polaris.shopify.com",
     "polaris-for-vscode"